Di2 insert for TRP (Tektro) Hylex brake levers, right hand only. This is the placeholder/blank insert that comes with the levers by default. I assume the left hand lever takes a mirror image but haven't actually verified that. Also I haven't modeled the semicircular half-cable-port things at the back of the lever so there will be a small gap there; it's not noticeable when riding.

Editable Onshape model (please let me know if you have any issues accessing it).